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Magnets (Regions) (1087)
Instruction:
Locate some magnets in the grid. A magnet is two square cells that touch along an edge; one cell must be marked with only a "positive" (+) symbol and the other cell must be marked with only a "negative" (–) symbol. Cells that share an edge cannot contain the same symbol.
The grid is divided into regions. Every magnet must be fully within some region (but a single region may contain any number of magnets, including zero). No cell belongs to more than one magnet (that is, magnets must not overlap).
The numbers above and to the left of the grid indicate the exact number of symbols of the specified type that must be placed in each column or row, respectively. If a number is not given, there might be any number of symbols of the specified type.